```cpp
T[cnt].val +=len*data%mod;
```
建议改成
```cpp
T[cnt].val +=1ll*len*data%mod;
```
by _Imaginary_ @ 2023-05-13 10:15:25
@[Birdly](/user/620253)
by auto_iterator @ 2023-05-13 10:20:07
@[_Imaginary_](/user/148507) 感谢，还有别的地方吗
by auto_iterator @ 2023-05-13 10:22:27
@[Mxq0602](/user/552608)
by auto_iterator @ 2023-05-13 10:43:12